Patent SG-11201408361T-A (SG)
Title: Image coding method, image decoding method, image coding apparatus, image decoding apparatus, and image coding and decoding apparatus
Inventor: TERADA KENGO
Filed: 2013-06-07
Abstract: (i2) mwu ft iz s-5 iv x m £ titz s issaj n d9) mm IHMMi _ (43) 2013 ^ 12 ^ 27 0(27.12.2013) WIPO I PCT (10) WO 2013/190796 A1 (51) H04N 7/26 (2006.01) (21) (22) (25) (26) (30) 4>§fl(£> s In: PCT/JP2013/003 607 2013 ^6^ 7 0(07.06.2013) 61/663,121 2012^6^ 22 0(22.06.2012) US (71) ttiHA: / \ ^\" V — S # |± (PANASONIC CORPORATION) [JP/JP]; T 5718501 X EfcJfr P! 6 M rfr 1 O O 6#±fe Osaka (JP). (72) ^69 fiIH(TERADA, Kengo). E (NISHI, Takahiro). $£W- Pit](SHIBAHARA, Youji). ^ J11 ffsf (TANIKAWA, Kyoko). ® # #6(5 (SA- SAI, Hisao). ^J1 SftJS(SUGK), Toshiyasu). I&E ^(MATSUNOBU, Toru). (74) ft IS A : Iff E JA^, ^ (Nil, Hiromori et al ); T 5320011 ^M^BRrfT^JIIIZE^SSTg 3# 1 o 4 h-tf7«f*Hiiif;u6ie«fg s^UPJlfa Osaka (JP). (8i) IS ^ PJ ft ): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) > ±T(Dmm(Dfcm% 11^ nlfb): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, SZ, TZ, UG, ZM, ZW), 3. — =j V T (AM, AZ, BY, KG, KZ, RU, TJ, TM), 3 — • V / ^ (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). - (&&£ 21 &(3)) (54) Title: IMAGE ENCODING METHOD, IMAGE DECODING METHOD, IMAGE ENCODING DEVICE, IMAGE DECOD­ ING DEVICE, AND IMAGE ENCODING AND DECODING DEVICE = (54)f6iEa>€ffc:Bfti^Ht£&, Wimmt gs. wmwmw. \o o\ l> o o\ i-H en i-H o CJ o & [032B] ( Mfe ) * t = > f ' .S711 .5712 ( »T ) BB AA... S711. S712. SWITCH BB... START . DETERMINE WHETHER THERE IS A COEFFICIENT THE ABSOLUTE VALUE OF WHICH EXCEEDS THRESHOLD A IN THE COEFFICIENT BLOCK IMMEDIATELY PRIOR . CONTEXT DEPENDING ON DETERMINATION RESULTS END lutein SICJJXT, lutein h£^y§*.3 (s 712), (57) Abstract: Provided an image encoding method that is uses arithmetic encoding and that comprises the following: a first flag encoding step (S701) for arithmetically encod­ ing a first flag (greaterl_flag) indicating whether an abso­ lute value of a processing-object coefficient included in the coefficient block of the processing object greater than is 1; and a second flag encoding step (S702) for arithmetically encoding second flag (greater2_flag) a indicating whether the absolute value of the processing-object coefficient is greater than 2. In the first flag encoding step and the second flag encoding step, it is determined whether there is a coefficient the absolute value of which exceeds a threshold in the coefficient block immediately prior to the coefficient block of the processing object (S711), and de­ pending on the determination results, the context used in the arithmetic encoding of the first flag and the second flag is switched (S712). (57)sift: •efcot, stf 1 £ y % 1 77^ (greaterl f la g) ^Iffi^ftt^I177^tXf'7 -J (s 7 o 1) t, luf W2d;y^jL«^tl2 77^ (g r e a t e r 2 f I a g) & (S 7 0 2 )